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Table 1

Spectroscopic parameters of the rotational transitions of CH2 studied in this work.

Transition Frequency AE Sij Eu

J′− J′′ F′− F′′ [MHz] 1 × 10−6 [s−1] [K]
(para-CH2)

3−4 444825.666 59.8 0.928 155.97
2−3 439960.991 64.3 1.353 156.27
1−2 444913.930 70.1 0.631 155.85

= 404−313 (ortho-CH2)

5−4 6−5 68371.278 0.216 2.329
5−4 68375.875 (**) 0.208 1.892 224.22
4−3 68380.873 0.206 1.533

4−3 3−2 70678.633 0.214 1.077
4−3 70679.543 (**) 0.210 1.413 224.76
5−4 70680.720 0.223 1.842

3−2 2−1 69007.179 0.171 0.691
3−2 69014.202 (**) 0.181 1.023 224.15
4−3 69019.187 0.204 1.480

Notes. The spectroscopic data – frequencies, Einstein A-coefficients (AE) and line strengths (Sij) were taken from Ozeki & Saito (1995) and the Cologne Database for Molecular Spectroscopy (Müller et al. 2005). (**) Indicates the central HFS transition, which was used to set the velocity scale in the analysis.

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